Tessa is correct. Joan fontaine is always listed as Tessa in TGE constant nymph but tge characters real name is Teresa ,spelled tge same as Teresa Perone.
GINNIE- ROMY and I spelled it differently, but aren’t the roles both spelled GINNIE on IMDB.
QM's own initials listed for "G" name : G) -- GJ / GM
And, no, on both Wikipedia and IMDb, the Gloria Grahame character in Crossfire is spelled "Ginny" whereas the Shirley MacLaine character in Some Came Running is spelled "Ginnie".